By

Osama Elzaafarany

May 2014

Stage IV prostate cancer : is defined by the American Joint Committee on Cancer's TNM

classification system:

T4, N0, M0, any prostate-specific antigen (PSA),

any Gleason.

Any T, N1, M0, any PSA, any Gleason.

Any T, any N, M1, any PSA, any Gleason

Metas.

dis.

Approximately 10-20% of newly diagnosed

prostate cancer cases involve locally advanced

disease.

Advanced disease is comparably less common,

because more early stage cancer is being

discovered d.t. PSA screening.

Presentation Median survival

Asymptomatic

(limited) metastases

~18 to 24 months

Asymptomatic

(extensive) metastases

~18 months

Symptomatic

metastases

~9 to 16 months

Manifestations of metastatic and advanced disease

may include the following:

• Anemia

• Bone marrow suppression

• Weight loss

• Pathologic fractures

• Spinal cord compression

• Pain

• Hematuria

• Ureteral and/or bladder outlet

obstruction

• Urinary retention

• Chronic renal failure

• Urinary incontinence

• Symptoms related to bony or

soft-tissue metastases

Mainstay: “androgen suppression”.

It is a palliative tool, no cure.

Results of treatment:

• median progression-free survival = 18-20 ms

• overall survival = 24-36 ms.

All patients develop hormone-refractory disease.

Put in consideration the toxic effects of treatment.

Any T, N1: Treatment includes ADT or radiation therapy (doses of 78-80+ Gy)

with 3D-CRT/IMRT with IGRT plus long-term neoadjuvant/concomitant/adjuvant

ADT for 2-3y

Any T, any N, M1: Treatment includes only ADT for patients with M1

Metas. prostate ca.

Initial therapy CRPC

Casteration-resistant

ADT Androgen Deprivation

Standard

Supportive care.

Bisphosphonates

PSA doubling

Symptoms

Hormonal Chemo.

2 nd line

Testosterone < 50 ng/dl

Aim

Surgical Medical

Bilat orchiectomy • LHRH agonist: (e.g. goserelin, leuprolide)

( + oral antiandrogen ≥7 days to avoid testosterone

flare).

• LHRH antagonist. (e.g. degarelix )

• CAB: combined androgen blokade:

LHRH agonist + oral antiandrogen

How?

Patients who do not show an adequate suppression of serum testosterone (< 50 ng/dL) may be considered for CAB

Monotherapy of nonsteroidal antiandrogens are less effective but are associated with fewer hot flashes and fatigue and do not impair libido

If hormone therapy fails, that therapy should be continued into and through the next hormone manipulation.

Recent data showed that CAB is not superior to LHRH-agonists alone in treatment of metas PC.

Gonadotropin-releasing hormone agonists:

• Therapy with GnRH analogs may induce medical castration by suppressing

LH production

• These agonists can potentially cause a transient surge of LH when therapy

is initiated before the LH levels fall (flare phenomenon)

• GnRH agonists are offered in 1mo, 3mo, and once-yearly depots; it is

necessary to premedicate with antiandrogen to prevent flare phenomenon

• Leuprolide: 7.5 mg IM monthly or 22.5 mg IM every 3ms or 30 mg IM every

4ms or 45 mg IV every 6ms.

• Histrelin: one 50mg implant SC every 12ms ; continue therapy until disease

progression.

• Goserelin: 3.6 mg implant SC monthly or a 10.8 mg implant SC every 3ms.

• Triptorelin: 3.75 mg IM monthly or 11.25 mg IM every 3mo or 22.5 mg IM every

6ms.

Gonadotropin-releasing hormone antagonists:

• Pure GnRH antagonists suppress testosterone and avoid

the flare phenomenon associated with GnRH agonists.

• Degarelix: 120 mg SC x 2 doses (ie, 2 separate injections

totaling 240 mg), and then, after 28 days, begin monthly

maintenance dose of 80mg SC.

Nonsteroidal antiandrogens:

• Antiandrogens bind to androgen receptors and competitively

inhibit their interaction with testosterone and dihydrotestosterone

• These agents do not decrease LH levels and androgen

production

• Antiandrogens are usually used in combination with a GnRH

agonist in order to prevent a disease flare caused by the transient

increase in testosterone levels.

Flutamide 250 mg PO TID.

Bicalutamide 50 mg PO daily; patients refractory to other antiandrogen

agents may start with 150 mg PO daily.

Nilutamide 300 mg PO daily for 30 days, and then 150 mg PO daily.

SWOG trial, NEGM 2013

Metas Prostate Ca.

7 ms induction

ADT RAND

If

PSA ≤ 4

Intermittent

VS

continous

Survival results are inconclusive

According to NCCN guidelines:

You can consider intermittent ADT when the adverse effects of

ADT is a matter

1) Hot flushes.

2) Osteoporosis.

3) Fractures.

4) Obesity.

5) Insulin resistance.

6) DM.

7) Alteration in lipids.

8) Cardiovascular dis.

pain Bone health

Diabetes

Cardio-vascular

Calcium + Vit-D

Denusomab / 6ms

Dexa scan / 1y

RTx. strontium-89

samarium-153

Definition:

hormone-refractory prostate cancer is defined as

2-3 consecutive rises in prostate-specific antigen (PSA)

levels obtained at intervals of > 2 weeks

and/or

Documented disease progression based on:

Findings from CT scan and/or bone scan.

Bone pain.

Obstructive voiding symptoms.

With castration levels of Testosterone: ( < 50 ng/dl)

Maintain the castration

Asymptomatic Symptomatic

Docetaxel / 3ws

+

Prednisone 5mg x 2 daily

Imaging studies +ve

or

PSA DT < 10 ms

Secondary hormone therapy

Denosumab or Zomita / month

Aberaterone Acetate. (® Zytiga 250 mg tab)

Enzalutamide. (® Xtandi 40 mg caps)

Ketoconazole. (® Nizoral 100 mg tab)

DES: diethylstilbesterol. (® Stilphostrol 1mg tab)

Coricosteroids. (e.g: prednisone 5 mg tab)

Anti-androgens: non-steroidal:

Bicalutammide. (® Casodex 50 mg caps, 1 X1)

Flutamide. (® Eulexin 250 mg tab, 1 X 3)

Nilutamide

4 tabs once daily, on empty stomach.

Androgen synthesis inhibitor

To be taken with prednisone tab (5mg 1 x 2).

FDA approval as first line therapy in asympt CRPC and as

second line therapy after failure of Docetaxel.

Precautions:

Monitor Bld pressure / month.

Most common S.E:

Fatigue, back+joint pain, periphr edema., HTN

Serious S.E: hepatic, cardiac and electrolytes.

• Monitor liver functions, K+, Phosphorus / month.

• Monitor Bld pressure / month.

COU-AA-301 trial: De Bono et al, NEGM, 2011

~ 1200 pts.

Progression on Docetaxel.

PS ≤ 2.

Testosterone ≤ 2nmol/liter

Excluded if:

•Liver enz ≥ 2.5 times norm.

•Chr liver dis.

•Active hepatitis.

•Uncontrolled HTN.

•Prevoius Ketoconazole.

•Signif cardiac dis.

RAND

Zytiga + prednisone

Prednisone

Increase OS: 15 ms VS 11 ms

(P < 0.001)

More SE : HTN, edema, K+

Phase III trial by Ryan CJ et al, NEGM, 2013

Aberaterone acetate as first line in asymptomatic CRPC

~ 1080 pts.

Metas CRPC

Asympt or minimal sympt.

RAND

Zytiga + prednisone

Placebo + Prednisone

Improvement of radiograph PFS: 16.5 ms VS 8 ms (P<0.001)

Anti-androgen:

Inhibit signaling of androgen receptor at multiple levels.

Dose: 4 caps once daily, +/- food.

Not necessary to take prednisone with it.

Could be used in pts with poor PS.

Less S.E than Abiraterone.

Given with GnRH agonists.

Seroius S.E: Seizures. (0.6 %)

~ 1200 pts.

Progression on chemo.

Any PS

Visceral metas.

RAND

Enzalutamide

Placebo.

Increase MS: 13.5 ms VS 18.5 ms

(P < 0.001)

SE mild : Fatigue, diarrhea,

hot flushes

Ongoing PREVAIL trial to asses the role

of Enzalutamide in pre-docetaxel settings

Provenge ®:

IV over 60 min / 2 weeks x 3 cycles.

Immunotherapy.

Autologous cancer vaccine.

1) Collect bld from pt.

2) Separate APC (Ag-presenting cells)

3) Exposure to (PAP-GM-CSF

recombinant fusion gene) ; “prostatic acid phosphatase”

4) Re-infuse in the same pt.

• Metas CRPC.

• First line in asympt or minimal sympt pts.

• Good PS.

• Life expectancy > 6 ms.

• No visceral metas.

It was resulted in 22% reduction in mortality when

compared to placebo in a phase III trial, which was

published by Kantoff PW et al, NEGM 2010.

Common S.E: chills. pyrexia and headache.

Semi-synthetic taxane

derivative.

Dose:

25 mg/m2 over 1 hr / 3weeks.

After failure of Docetaxel.

TROPIC trial, Lancet 2010.

Updated Ann Oncol, 2013

755 pts. CRPC

Progression on

Docetaxel.

RAND

Cabazitaxel + prednisone

Mitoxantrone + prednisone.

2.5ms

Improv.

in OS

Xofigo ®

alpha particle-emitting radioactive

therapeutic agent (half life~11 day)

I.V injection over 1 min.

Every 4 weeks X 6 cycles.

Dose: 1.35 micro-curie / Kg.

Symptomatic CRPC + Bone metas – no visceral metas

The most common adverse drug reactions (≥ 10%) were nausea,diarrhea,

vomiting, and peripheral edema.

The most common hematologic laboratory abnormalities (≥ 10%) were

anemia, lymphocytopenia, leukopenia, thrombocytopenia, and neutropenia

ALSYMPCA, NEGM 2013

ADT associated with 20-50% relative increase of fracture risk.

ADT decrease bone menial density.

Longer treatment duration greater fracture risk.

Fracture risk can be assessed using algorithm FRAX®

NCCN recommendations: (with ADT)

Supplemental Calcium (1200 mg daily) + vit-D (1000 IU daily).

Base line DEXA scan then annually.

Denosumab: 60 mg / 6ms : phase III trial in non-metas PC

showed that Denosumab increase bone menial density by 6.7%

and reduces the risk of fracture ( from 3.9% to 1.5%); Smith MR et

al, NEGM 2009; 361(8):745-55.

Or Zoledronic acid (5mg/12 ms).

Bone health in metas PC:

JNCI,2002

Updated in 2004

643 pts

CRPC: Asympt.

Or minimal sympt.

Zometa VS

Placebo

Increase median time

To SRE

No effect on OS.

Phase III trial, Lancet 2011.

CRPC pts:

(Good PS + no previous bisphosphonates + life expectancy > 6ms. )

Denosumab: 120 mg / month

Zoledronic acid : 4 mg / 4 weeks.

Hypocalcaemia more with Denosumab: (13% VS 6%)

SREs were similar

Median time to first SRE increase with Denosumab:

(21 ms VS 17 ms)

Considering the possible minimal survival benefit together with

the cost and toxicity of the additional anti-androgen, first-line

hormonal management of metastatic prostate cancer should be

based on chemical or surgical castration only [I, B].

Patients who develop castration-resistant prostate cancer

(CRPC) should continue androgen suppression and be

considered for further hormone therapies; • Chemotherapy might be preferable in those with poor initial

hormone response or severe symptoms.

• In patients progressing following docetaxel, treatment with

abiraterone, or enzalutamide, should be discussed if not used

previously [II, A].

Docetaxel using a 3-weekly schedule should be considered for

symptomatic, castration-resistant disease [I, A].

Cabazitaxel is more effective than mitoxantrone in patients previously

treated with docetaxel [I, B].

External beam RT should be offered for patients with a moderate number

of painful bone metastases (1×8 Gy has equal pain-reducing efficacy to

multifraction schedules) [I, A].

Bone targeted therapy with one of the beta particle emitting radionuclides

(strontium-89 and samarium-153) should be considered for patients with

painful bone metastases [II, B].

In patients with bone metastases from CRPC at high risk for clinically

relevant SREs, denosumab or zoledronic acid can be recommended,

and a large trial found that denosumab delayed SREs for longer than

zoledronic acid. Neither agent has been shown to prolong survival [I, B].

MRI of the spine to detect subclinical cord compression should be

considered in men with CRPC with vertebral metastases and back pain [III,

B].